Antec SF850X 850W SFX Power Supply – Fully Modular, 80 PLUS Gold

Antec SF850X 850W SFX Power Supply – Fully Modular, 80 PLUS Gold

Antec SF850X 850W 80 PLUS Gold is a compact, high-performance SFX power supply engineered for small-form-factor gaming and high-density builds. ATX 12V 3.1 (SFX 4.1) compliance and a native PCIe 5.1 12VHPWR connector let the SF850X power modern GPUs while preserving case space. Premium Japanese capacitors, an active-clamp + DC‑DC design and 80 PLUS Gold efficiency deliver stable voltages and low ripple for tight regulation under load. The fully modular cable set simplifies cable management and airflow, and the Zero RPM Manager balances silence with efficient cooling. CircuitShield™ protections and a 7‑year warranty provide long-term reliability for enthusiast and competitive builds where space and performance matter.

Features and Benefits

• 850W output in an SFX 4.1 form factor (100 × 125 × 63.5 mm) for powerful small‑form‑factor systems.
• ATX 12V 3.1 compatibility with a native PCIe 5.1 12VHPWR (16‑pin) cable for modern GPUs.
• 80 PLUS Gold certification for efficient power delivery and reduced heat/waste.
• High‑quality Japanese (JP) capacitors plus active clamp + DC‑DC topology for tight voltage regulation and low ripple.
• Fully modular cabling for clean installs, improved airflow, and easier cable routing in compact cases.
• Zero RPM Manager: fan only spins when needed to keep operation quiet during light loads.
• CircuitShield™ protection suite (OCP, OVP, UVP, SCP, OPP, OTP, SIP, NLO) and 7‑year warranty for dependable operation.

Sizing Information

What's in the box

• SF850X power supply (SFX 4.1)
• Full-modular cable set (including 16‑pin 12VHPWR GPU cable)
• Mounting screws and SFX→adapter bracket (if included by region)
• AC power cord
• User manual and warranty information

Product Q&A

• Q: Is the SF850X compatible with modern RTX 40/50 series GPUs?
  A: Yes — it includes a native PCIe 5.1 16‑pin (12VHPWR) cable and is ATX 12V 3.1 compliant to support current high‑end graphics cards.
• Q: Will this fit in a Mini‑ITX or other small cases?
  A: Yes — the SF850X uses the SFX 4.1 form factor (100 × 125 × 63.5 mm), designed for small‑form‑factor cases that support SFX/SFX‑L or SFX 4.1 with appropriate mounting.
• Q: How noisy is the PSU during normal use?
  A: It features a 92 mm silent fan with Zero RPM Manager, so the fan remains off at light loads for near‑silent operation and spins only when thermal conditions require active cooling.
• Q: What protections and warranty are provided?
  A: CircuitShield™ protections (OCP, OVP, UVP, SCP, OPP, OTP, SIP, NLO) are built in; the unit is backed by a 7‑year warranty.
• Q: Are all cables included and modular?
  A: Yes — the SF850X is fully modular so you connect only the cables you need for a cleaner build and better airflow.